Van Dijk is only so effective and scary because attackers are in a hurry, as you said, avoiding the press. They have to act immediately, almost perfectly or Van Dijk (or another Liverpool player) breaks down their attack. When he was at Southampton it was obvious he is a class defender but never so dominant and impossible to beat. Main reason was that opponents had more time, could evaluate options, pick the best pass, adjust their feet, etc. It's not like he's superhuman or anything. It's a team effort and he's the biggest beneficiary out of it. It helps that he keeps his composure and has much greater anticipation than his partners in defence (all of them, imo).
As for Lindelof, if we continue harassing opposition as we have since the restart, his own qualities will either shine or his limitations will be further exposed. It will become like the goalkeeper position where during the whole game there are only a few moments when needed to act and show their quality. Focus concentration and anticipation are key. I, personally, like him and believe in him but who knows, maybe Ole sees a better partner for Maguire in Tuanzebe or a potential transfer target.